Difficulty: Easy
Correct Answer: To come to nothing; yield no result
Explanation:
MeaningIf an effort "ends in smoke", it fails or produces no concrete result.
Option analysisTo come to nothing; yield no result — exact sense. ✅(a) Opposite (understanding is a positive result).(c), (d) — unrelated outcomes.
Example"Months of negotiations ended in smoke."
Final AnswerTo come to nothing; yield no result.
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